/*
struct TreeNode {
	int val;
	struct TreeNode *left;
	struct TreeNode *right;
	TreeNode(int x) :
			val(x), left(NULL), right(NULL) {
	}
};*/
class Solution {
public:
    void Mirror(TreeNode *pRoot) {
    	if(pRoot == nullptr)
    		return ;
    	TreeNode *temp = pRoot->left;
    	pRoot -> left = pRoot ->right;
    	pRoot ->right = temp;
    	Mirror(pRoot->left);
    	Mirror(pRoot->right);
    }
};